UESaveFile: add sanity check when reading files.

src/UESaveFile/UESaveFile.cpp

@@ -197,5 +197,9 @@ void UESaveFile::loadData() {
         arrayAppend(_properties, std::move(prop));
     }
 
+    if(_properties.back()->name != "None" && _properties.back()->propertyType != "NoneProperty") {
+        return;
+    }
+
     _valid = true;
 }